Contract Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 26, 2020	Sep. 26, 2020	Dec. 31, 2019
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Abstract]
Current Contract Assets, Net	$ 697	$ 697	$ 603
Noncurrent Contract Assets, Net	11	11	17
Current Contract Liabilities	1,047	1,047	916
Noncurrent Contract Liabilities	674	674	$ 594
Revenue recognized that was included in the current contract liability balance at the beginning of the period	$ 142	$ 773